Overhead gantry
First Claim
1. A transportable overhead gantry for spanning a roadway, comprising:
- two supports defining masts and one cross-member for carrying traffic signs, the supports being provided with lifting means for lifting and lowering the cross-member along the supports, the supports being foldable towards one another in a plane of the cross-member and the cross-member being telescopically retractable, whereby the gantry can be folded up with the cross-member lowered and transported on a truck, and further comprising a self-acting brake operable to fix the cross-member to the supports in the event of failure of the lifting means.
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Accused Products
Abstract
The instant invention concerns a transportable overhead gantry for spanning a roadway having two supports linked in an articulated manner to a cross-member. The cross-member is adjustable for height, for example using a winch operable to move the cross-member along the supports and, being made up of three or four parts, can be telescopically retracted. The supports can be folded towards each other in a plane defined by the cross-member so that the entire overhead gantry can be transported on a conventional truck. The overhead gantry can be erected at any point along a multi-lane expressway without special machinery or equipment and is thus suitable for the rapid and temporary display of traffic signs.
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Citations
10 Claims
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1. A transportable overhead gantry for spanning a roadway, comprising:
two supports defining masts and one cross-member for carrying traffic signs, the supports being provided with lifting means for lifting and lowering the cross-member along the supports, the supports being foldable towards one another in a plane of the cross-member and the cross-member being telescopically retractable, whereby the gantry can be folded up with the cross-member lowered and transported on a truck, and further comprising a self-acting brake operable to fix the cross-member to the supports in the event of failure of the lifting means. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A transportable overhead gantry for spanning a roadway, comprising:
two supports defining masts and one cross-member for carrying traffic signs, the supports being provided with lifting means for lifting and lowering the cross-member along the supports, the supports being foldable towards one another in a plane of the cross-member and the cross-member being telescopically retractable, whereby the gantry can be folded up with the cross-member lowered and transported on a truck, the lifting means being a cable operated mechanism and further comprising a self-acting brake operable to fix the cross-member to the supports in the event of a cable severing.
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8. A transportable overhead gantry, comprising:
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two support masts; a cross-member supported on the support masts, the cross-member having telescopic sections and means for receiving traffic signs; and
,carriages movable along each of the support masts, and lifting means operable to lift and lower the carriages along the support masts, the carriages being pivotally attached to the cross-member at joints permitting the support masts to be folded in a plane defined by the cross-member, whereby the gantry is foldable for transport and erectable along a shoulder of a road, and wherein the carriages are pivotable along an axis perpendicular to the cross-member and perpendicular to the masts, and further comprising a reinforcing strut removably attachable between the cross-member and the carriage at a space from said axis. - View Dependent Claims (9, 10)
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Specification